VAV Fumehood
 Custom Search With a vav fumehood the design and construction are similar to those for bypass fumehoods. This fumehood will maintain a constant face velocity by adjusting the the total exhaust airflow as the sash opens or closes. They rely on more sophisticated control hardware and algorithms for laboratory HVAC and exhaust systems, for fumehood exhausts and fumehood controllers, and ultimately attempt to minimize energy costs while still protecting the fumehood user. Some bypass fumehoods can be retrofitted for use as VAV hoods by the use of a blank off plate or restricted bypass opening, which effectively eliminates or reduces the bypass air entering the fumehood. This fumehood may be served by an individual fan which is speed controlled or a manifold duct system with VAV control device. The sash opening information is usually sensed by the position of a "string" positioning a potentiometer therefore providing feedback to the controls. Return from VAV Fumehood page to Homepage Build, host and track an SBI website $29.99 per month. |
